If you put your firing pins in, remove the lower, and re install it without spring or retaining pin. Make sure it is free in the firing pin channel.

If it is not, use a chain saw file and remove any burr where the firing pin retainer channel intersects with the firing pin channel. Also, you might chuck the firing pin in a drill and smooth off the large end of the firing pin with steel wool.

Re install and verify that pin has no interference. At this time, taking the other firing pin out and blowing the receiver out with brake cleaner is a good idea. Check the trigger pin. Sometimes, they will fall out and be lost. If it is loose, you can take a pair of Vice Grips and squeeze the LEFT end of the pin, to where it is a tap in fit in the receiver. This way, both firing pin retaining pins AND the trigger pin will come out RIGHT TO LEFT when needed.

Then, after spraying it down with a quality oil, (I use Rem Oil or Ballistol), re install pins and re assemble firearm.

If you still have misfires, but MUST shoot the Winchester, you might get some Wolff extra power mainsprings for your Citori. You only need to use this spring on the bottom (right) hammer. Save the second spring for your next service. If you still have trouble, it is time to swap ammo.

i had problems with Reloaded AA primers in my XT last year and along with a couple of other guys i shot with. The solution to our problem was to weld a very small amount of metal on to the end of the bottom barrel firing pin. That solved all of our problems